Experimental comparison of discrete Fourier transform-spread high-order quadrature amplitude modulation discrete multitone systems for optical interconnection

Jialin You; Xinxing Wu; Hailian He; Qinghua Xiao; Youxu Zeng; Yifan Chen; Ze Dong

doi:10.1117/1.OE.58.7.076101

8 July 2019 Experimental comparison of discrete Fourier transform-spread high-order quadrature amplitude modulation discrete multitone systems for optical interconnection

Jialin You, Xinxing Wu, Hailian He, Qinghua Xiao, Youxu Zeng, Yifan Chen, Ze Dong

Author Affiliations +

Optical Engineering, Vol. 58, Issue 7, 076101 (July 2019). https://doi.org/10.1117/1.OE.58.7.076101

Abstract

The performance of discrete Fourier transform-spread (DFT-spread) discrete multitone (DMT) transmission systems based on four high-order quadrature amplitude modulation (QAM) formats (4/16/32/64QAM) for optical interconnection is investigated and experimentally compared on the same platform. We first theoretically study and analyze the benefits of the implemented DFT spread for the peak-to-average power ratio (PAPR) deduction in DMT transmission systems, and then experimentally compare the receiver optical power sensitivities and transmission performance using flexible transceiver configuration in standard single-mode fiber (SSMF) link. Experimental results show that the power penalties are 1.2, 1.8, 2.2, and 2.7 dB for 10 Gbaud DFT-spread DMT signal employing 4/16/32/64QAM over 10-km SSMF transmission. There are, respectively, 0.3, 0.7, 0.9, and 1.1 dB transmission power penalty improvements by the implementation of the DFT-spread scheme, compared with the conventional DMT transmission systems. Furthermore, we experimentally compare the improved fiber nonlinear effect tolerance for the proposed DFT-spread DMT system, which shows the potential reach improvement and thus can provide an abundant system loss budget for leveraging legacy optical access networks. In addition, a comparison of the hardware implementation complexity of the DFT-spread scheme with several typical PAPR deduction schemes is also presented.

Citation Download Citation

Jialin You, Xinxing Wu, Hailian He, Qinghua Xiao, Youxu Zeng, Yifan Chen, and Ze Dong "Experimental comparison of discrete Fourier transform-spread high-order quadrature amplitude modulation discrete multitone systems for optical interconnection," Optical Engineering 58(7), 076101 (8 July 2019). https://doi.org/10.1117/1.OE.58.7.076101

Received: 7 April 2019; Accepted: 6 June 2019; Published: 8 July 2019

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